This is not bug really. It’s just wrong error message. What it in reality means is that router lacked the Internet connection at time of update run. We run update in some cases as part of boot process. What this in reality means is that your ISP is slow in IP address assignment and we managed to boot before you have the Internet connection. Because of this it received minimal priority and we had more important tasks to tackle than this. But it should be fixed in Turris OS 3.7. Better message was added in Updater’s version 55 and wait for the Internet connection was added in Updater’s version 58.0.